CAIE IGCSE Biology 22.1.7 Solve Qualitative and Quantitative Problems Topic Practice

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22.1.7 Solve qualitative and quantitative problems question 1

[Maximum number: 3]

Fig. 4.1 is a diagram of a virus.

Fig. 4.1

Fig. 4.1

The human immunodeficiency virus (HIV) infects and destroys lymphocytes.

The number of lymphocytes in the blood of a person infected with HIV was measured over a period of 84 months.

The results are shown in Fig. 4.2.
number of lymphocytes per mm3\mathrm{mm}^{3} of blood

Fig. 4.2

Fig. 4.2

Use the information shown in Fig. 4.2 to calculate the percentage change in the number of lymphocytes from month 10 to month 60.
Give your answer to two significant figures.
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